Get key Json and search with name var

Question

I have the following problem:

I have the following JSON:

var words = {
    "categorias": [
        {
            "Licores": ["Smirnoff", "Johnnie Walker", "Bacardi", "Martini", "Hennessy", "Absolut", "Jack Daniels", "Chivas Regal", " Baileys", "Ballantines", "CAPTAIN MORGAN", "CUERVO", "JAEGERMEISTER", "MOET ET CHANDON", "DEWARS", "JIM BEAM", "GALLO", "HARDYS", "CROWN ROYAL", "RICARD", "CONCHA Y TORO", "GREY GOOSE", "GORDONS", "GRANTS", "JAMESON", "MALIBU", "STOLICHNAYA", "MARTELL", "HAVANA CLUB", "REMY MARTIN", "PATRON", "YELLOWTAIL", "SAUZA", "SKYY", "FINLANDIA", "BERINGER", "TANQUERAY", "DREHER", "BEEFEATER", "BOMBAY", "SEAGRAM", "CANADIAN CLUB", "GLENFIDDICH", "COINTREAU", "TEACHERS", "KAHLUA", "BELLS", "CINZANO VERMOUTH", "LINDEMANS", "COURVOISIER", "CANADIAN MIST", "TORRES", "INGLENOOK", "CASTILLO", "KUMALA", "PENFOLDS", "LANSON", "Ron", "Vodka", "Whisky", "Bourbon", "Brandy", "Cognac", "Tequila", "Ginebra", "Vino blanco", "Vino tinto", "Champagne", "Cerveza", "Budweiser", "Heineken", "Sambuca", "Frangelico", "Triple Sec", "Licor de cafe", "Kirsch", "Fernet", "Aguardiente", "Pisco", "Sangría", "Mojito", "Margarita", "Cuba libre", "Daiquiri", "Cosmopolitan", "Caipirinha", "White Russian", "Coco Loco", "Mai Tai", "Manhattan", "Zombie", "Gintonic", "Hurricane", "Negroni", "Paloma", "Farnell"]
        },
        {
            "animales": ["Abadejo", "Abanto", "Abeja", "Abeja doméstica", "Abejorro", "Abubilla", "Abulón", "Acedía", "Acentor", "Acevia", "Acocil", "Acranio", "Actinia", "Addax", "Agachadiza", "Aguará", "Águila", "Agutí", "Ajolote", "Alacrán", "Albatros", "Alburno", "Alcaraván", "Alcatraz", "Alcaudón", "Alce", "Alcélafo", "Alimoche", "Almeja", "Alondra ibis", "Alosa", "Alpaca", "Alzacola", "Ameba", "Ampelis", "Anaconda", "Anchoa", "Anfioxo", "Angelote", "Anguila", "Aninga", "Anoa", "Anolis", "Ánsar", "Anta", "Antílope", "Araguato", "Araña", "Arapaima", "Arapapa", "Ardilla", "Arenque", "Argonauta", "Armadillo", "Armiño", "Arrendajo", "Asno", "Atún", "Avefría", "Avestruz", "Avispa", "Avetoro", "Avispón", "Avoceta", "Avutarda", "Ayeaye", "Ayu", "Babirusa", "Babosa", "Babuino", "Bacalao", "Baiji"]
        }
    ]
}

So when I want search a Categoria I call this function:

function random(max){
    return Math.floor((Math.random() * max) + 0);
}

Now as the Key of JSON is a array (categorias), and this key i want get of way random, then i use Object.keys(), and it runs smoothly, when i assigned the var namKeyJson to Object.keys(words.categorias[randomCategory]), i returned the name of the key which i need

var lengthCategory = words.categorias.length-1;
var randomCategory = random(lengthCategory);
var nameKeyJson = Object.keys(words.categorias[randomCategory]);
nameKeyJson = nameKeyJson.toString();

the problem is when i want get the values or the length the categorys of array, and that by placing the variable nameKeyJson, takes the name of the variable but not its value.

var lengthPregunta = words.categorias[randomCategory].nameKeyJson.length; 
console.log(lengthPregunta);

Thanks for help me.

Your problem is not so clear.. What exactly you want? – Vicky Gonsalves Feb 21 '16 at 06:19 — Vicky Gonsalves, Feb 21 '16 at 06:19

score 2 · Accepted Answer · answered Feb 21 '16 at 06:18

2

var lengthPregunta = words.categorias[randomCategory].nameKeyJson.length;

Should be

var lengthPregunta = words.categorias[randomCategory][nameKeyJson].length;

You try to call 'nameKeyJson' from words.categorias[randomCategory] instead of indexing key by nameKeyJson.

answered Feb 21 '16 at 06:18

yujuiting

61
2

Thanks. the code works without a problem – Miguel Angel Gonzalez Pinto Feb 21 '16 at 06:22

score 0 · Answer 2 · answered Feb 21 '16 at 06:23

Use bracket notations: words.categorias[randomCategory][nameKeyJson]

and with your code it will always return only first variable. So change
var lengthCategory = words.categorias.length-1; to
var lengthCategory = words.categorias.length;

var words = {
  "categorias": [{
    "Licores": ["Smirnoff", "Johnnie Walker", "Bacardi", "Martini", "Hennessy", "Absolut", "Jack Daniels", "Chivas Regal", " Baileys", "Ballantines", "CAPTAIN MORGAN", "CUERVO", "JAEGERMEISTER", "MOET ET CHANDON", "DEWARS", "JIM BEAM", "GALLO", "HARDYS", "CROWN ROYAL", "RICARD", "CONCHA Y TORO", "GREY GOOSE", "GORDONS", "GRANTS", "JAMESON", "MALIBU", "STOLICHNAYA", "MARTELL", "HAVANA CLUB", "REMY MARTIN", "PATRON", "YELLOWTAIL", "SAUZA", "SKYY", "FINLANDIA", "BERINGER", "TANQUERAY", "DREHER", "BEEFEATER", "BOMBAY", "SEAGRAM", "CANADIAN CLUB", "GLENFIDDICH", "COINTREAU", "TEACHERS", "KAHLUA", "BELLS", "CINZANO VERMOUTH", "LINDEMANS", "COURVOISIER", "CANADIAN MIST", "TORRES", "INGLENOOK", "CASTILLO", "KUMALA", "PENFOLDS", "LANSON", "Ron", "Vodka", "Whisky", "Bourbon", "Brandy", "Cognac", "Tequila", "Ginebra", "Vino blanco", "Vino tinto", "Champagne", "Cerveza", "Budweiser", "Heineken", "Sambuca", "Frangelico", "Triple Sec", "Licor de cafe", "Kirsch", "Fernet", "Aguardiente", "Pisco", "Sangría", "Mojito", "Margarita", "Cuba libre", "Daiquiri", "Cosmopolitan", "Caipirinha", "White Russian", "Coco Loco", "Mai Tai", "Manhattan", "Zombie", "Gintonic", "Hurricane", "Negroni", "Paloma", "Farnell"]
  }, {
    "animales": ["Abadejo", "Abanto", "Abeja", "Abeja doméstica", "Abejorro", "Abubilla", "Abulón", "Acedía", "Acentor", "Acevia", "Acocil", "Acranio", "Actinia", "Addax", "Agachadiza", "Aguará", "Águila", "Agutí", "Ajolote", "Alacrán", "Albatros", "Alburno", "Alcaraván", "Alcatraz", "Alcaudón", "Alce", "Alcélafo", "Alimoche", "Almeja", "Alondra ibis", "Alosa", "Alpaca", "Alzacola", "Ameba", "Ampelis", "Anaconda", "Anchoa", "Anfioxo", "Angelote", "Anguila", "Aninga", "Anoa", "Anolis", "Ánsar", "Anta", "Antílope", "Araguato", "Araña", "Arapaima", "Arapapa", "Ardilla", "Arenque", "Argonauta", "Armadillo", "Armiño", "Arrendajo", "Asno", "Atún", "Avefría", "Avestruz", "Avispa", "Avetoro", "Avispón", "Avoceta", "Avutarda", "Ayeaye", "Ayu", "Babirusa", "Babosa", "Babuino", "Bacalao", "Baiji"]
  }]
}

function random(max) {
  return Math.floor((Math.random() * max) + 0);
}


var lengthCategory = words.categorias.length;
var randomCategory = random(lengthCategory);
var nameKeyJson = Object.keys(words.categorias[randomCategory]);

var lengthPregunta = words.categorias[randomCategory][nameKeyJson].length;
console.log(lengthPregunta);

Get key Json and search with name var

2 Answers2